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Self-Assembled Monolayers of Parent and Derivatized [N]Staffane-3,3

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Self-Assembled Monolayers of Parent and Derivatized [N]Staffane-3,3 J. Am. Chem. SOC.1992,114, 9943-9952 9943 Swedish Board for Technical Development (NUTEK) and Medivir (EMBO) through a 2-year EMBO fellowship to L.H.K. is AB, Lunastigen 7, S-141 44 Huddinge, Sweden, for generous gratefully acknowledged. financial support (to J.C.). Thanks are due to the Wallen- bergstiftelsen, ForskningsrAdsnPmnden, and University of Uppla Supplementary Material Available: Experimental details and for funds for the purchase of a 500-MHz Bruker AMX NMR tables of atomic coordinates, positional atomic coordinates, thermal spectrometer in J.C.'s lab. The Science and Engineering Research parameters, bond distances, bond angles, torsion angles, inter- Council and the Wellcome Foundation Ltd. are gratefully ac- molecular contacts, least-squares planes, and intensity data (24 knowledged for generous financial support (to R.T.W.). Financial pages); listing of structure factors (8 pages). Ordering information Support from the European Molecular Biology Organization is given on any current masthead page. Self-Assembled Monolayers of Parent and Derivatized [ n]Staffane-3,3("-' )-dithiols on Polycrystalline Gold Electrodes Yaw S. Obeng,+Mark E. Laing,' Andrienne C. Friedli, Huey C. Yang, Dongni Wang,f Erik W. Thulstrup,"Allen J. Bard,* and Josef Michl**l Contribution from the Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 7871 2-1 167. Received April 2, I992 Abstract: Synthesis of the terminally disubstituted rigid rod molecules, [n]staffane-3,3("')-dithiols, n = 1-4, and their singly functionalized derivatives carrying an acetyl or a pentaammineruthenium(II), [Ru(NH~)~]~+,substituent is described. Self-assembled monolayers of the neat [nlstaffane derivatives and of their mixtures with n-alkyl thiols were prepared on polycrystalline gold electrodes. Grazing incidence FTIR spectroscopy and comparison with polarized IR spectra of model compounds oriented in stretched polyethylene revealed that, in the films assembled directly from the dithiols, the average orientation of the [nlstaffane rods was halfway between perpendicular and parallel to the surface, whereas, in the films obtained from the singly functionalized derivatives, the rods were nearly perpendicular to the surface. The degree of ordering and packing was also investigated by contact angle measurements with deionized water. The electrode blocking properties of the films were investigated by three independent electrochemical techniques, cyclic voltammetry in a solution containing K,Fe(CN),, chronoamperometry in a solution of RU(NH,)~CI~,and cyclic voltammetry of the gold surface in sulfuric acid. The results from the three methods were in good agreement and showed that the films assembled from the dithiols were not as well organized as those obtained from the monoderivatized analogues. In situ hydrolytic removal of the protective acetyl groups and subsequent functionalization of the resultant film covered with free thiol groups with aquapentaammineruthenium(II), [RU(NH~)~(H~O)]*+, are possible without disturbing the structure of the film. Electrodes covered with monolayers carrying ruthenium pentaammine groups on their outer Surface exhibit oxidation-reduction waves at 0.51 V vs SCE attributable to the Ru(I1)-Ru(II1) couple, demonstrating electron transfer across the monolayer. The formal potential of the immobilized couple is about 60" more positive than that of the dissolved complex, [ [(NH3),Ru]-[n]staffanedithiol]2+,in 1 M HClO, solution. The surface concentration of Ru is the same in the films assembled from this complex and those produced by in situ functionalization of a film covered with free thiol groups and corresponds to a monolayer of (NH3)SRu. However, in the former type of fdm, the surface concentration of the staffane rods is only about half of that in the latter, implying that only about half of the surface thiol groups have been metalated. Introduction (n = 1-4), as well as mixed films formed with n-alkanethiols. We Terminally disubstituted [nlstaffanes ([a] 1) were originally find that careful basic hydrolysis converts films of [a15 undamaged developed for use as assembly elements in a molecular-size "Tinkertoy" construction set14 but can also be viewed simply as (1) (a) Kaszynski, P.; Michl, J. J. Am. Chem. SOC.1988, 220,5225. (b) a new class of straight and fairly rigid inert spacers suitable for Kaszynski, P.; Friedli, A. C.; Michl, J. Mol. Cvst. Liq. Cryst. Lett. Sect. 1988, investigations of electron and energy transfer. In this regard, 6, 27. (2) Michl, J.; Kaszynski, P.; Friedli, A. C.; Murthy, G. S.;Yang, HA.; terminal disubstitution with thiol-based gro~ps~-~is particularly Robinson, R. E.; McMurdie, N. D.; Kim, T. In Strain and Its Implicotions interesting, and preliminary results of an optical investigation of in Organic Chemistry; de Meijere, A., Blechert, S., Ms.;NATO AS1 Series; intramolecular electron transfer between Ru(I1) and Ru(II1) Kluwer Academic Publishers: Dordrecht, The Netherlands, 1989; Vol. 273, attached to ([a]3, n = p 463. 3,3("')-bis(methylthio)[n]staffanes 1,2), (3) Friedli, A. C.; Kaszynski, P.; Michl, J. Tetrahedron Lett. 1989,30,455. generated in situ from the isovalent species [a]2, have been (4) Kaszynski, P.; Friedli, A. C.; Mich, J. J. Am. Chem. Soc. 1992, 214, presented elsewhere., In this paper, we describe the formation 601. of self-assembled monolayers of neat [n]staffane-3,3("')-dithiols (5) (a) Bunz, V.; Polborn, K.; Wagner, H.-V.; Szeimes, G. Chem. Ber. ([a]4), thiol-thiol acetates (monothiols, [n]5), and thiol-ruthe- 1988,221, 1785. (b) Wiberg, H. B.; Waddell, S. T. J. Am. Chem. Soc. 1990, 112, 2194. nium pentaammine thiols ([a]6)(Figure 1) on gold electrodes (6) (a) Michl, J.; Friedli, A. C.; Obeng, Y.S.; Bard, A. J. Proceedings o/ the Sixth International Conference on Energy and Electron Tronsfec Fiala, *To whom correspondence should be addressed. J.; Pokorny, J., Eds.; Charles University: Prague, Czechoslovakia, 1989. The 'Present address: AT&T Bell Labs, Allentown, PA 18103. rates reported in this paper are too high due to the use of an erroneous *Present address: Unilever Research, Port Sunlight Laboratory, Quarry literature equation for data treatment. The correct rate constants are 1 X lo7 Road East, Bebington, Wirral L63 3JW, England. and 2 X lo6 s-I for [1]3 and [2]3, respectively, in 0.1 M DCI in D20. (b) I Present address: Chemistry Department, The Royal Veterinary and Positions on the individual bicyclo[l.l.I]pentane cages in an [nlstaffane are Agricultural University, DK- 187 1 Frederiksberg, Denmark. distinguished by the number of primes, from no primes at one of the terminal Present address: Institute I, Roskilde University, DK-4000 Roskilde, cages to n - 1 primes on the other terminal cage. Thus, the terminal Denmark. bridgehead positions in (2lstaffane are 3 and 3', in [3]staffane, 3 and 3", and Resent address: Department of Chemistry and Biochemistry, University in [nlstaffane, 3 and 3 with n - 1 primes, indicated by 3(*'), following the of Colorado, Boulder, CO 80309-0215. usage common in mathematics. 0002-7863/92/15 14-9943%03.00/0 0 1992 American Chemical Society 9944 J. Am. Chem. SOC.,Vot. 114, No. 25, I992 Obeng et at. Absolute ethanol (Aaper Alcohol and Chemical Co., Shelbyville, KY), acetonitrile (Fisher Scientific), and acetone (Mallinkrodt, Paris, KY) were used as received. Equipment and Measurements. Melting points were determined using a Boetius PHMKOS apparatus, with microscope attachment, at a warm- up rate of 4 "C min ' or in a sealed capillary and are uncorrected. Boiling points are also uncorrected. NMR spectra were run at 360 MHz in CDCI, on a Nicolet NT-360 instrument, unless specified otherwise. Chemical ionization (CI) and electron impact (EI) mass spectra were obtained on Bell & Howell 21-491 and VG ZAB-2E spectrometers, respectively. Elemental analyses were performed at Atlantic Microlabs, Norcross, GA. Preparative gas chromatography was performed on 6-ft SE-30 20% on Chromosorb column. Infrared (IR) spectra of 3,3("')-bis(a~etylthio)[n]staffanes~*~([n]7, n = 1-4). aligned in stretched polyethylene, were recorded at room temperature in the 40+2000-cm-' region on a Perkin-Elmer 1702 FTIR instrument equipped with a SPECAC Model KRS-5 linear polarizer in the sample beam. The resulting spectra, E,(;), with the electric vector parallel to the polymer-stretching direction, and Ed;), with the electric vector perpendicular to this direction, were base-line corrected. Narrow regions near 730 and 1480 cm-' were blocked by the absorption of the polymer. Figure 1. Schematic representation of the chemical transformations of The polymer sheets were prepared by cutting a 2-mm thick wall of a a film of type A into a film of type E. polyethylene laboratory bottle (Kartell, Germany), heating it to 150 "C and quenching it in cold water to improve its optical quality, and then stretching it to 400% of its original length. The stretched sheet was kept into films of [n]4 and characterize the structures and the elec- in a concentrated solution of the staffane derivative in chloroform at 40 trochemical properties of all of these. The formation of a self- "C for up to 24 h, until a desired optical density of the solute was achieved. This had no significant effect on the degree of alignment of the polymer. All other infrared spectra were recorded at 4-cm-' resolution on a Nicolet 60SXR FTIR instrument using a HgCdTe detector cooled with liquid nitrogen. Isotropic spectra were measured in KBr pellets unless stated otherwise. Grazing incidence measurements on films deposited X Y film type on a 1 X I-in. Au-coated glass were performed at an incidence angle of H H 84". using a Harrick model RMA-OOG reflection attachment and a wire [ (NH,),RuMeS] 2A [ (NH,),RuMeS] 2+ grid polarizer (IGP225, Cambridge Physical Science). Typically 4000 [ (N H,),RuMeS] 2+ [ (N H,),RuMeS] 3+ scans were recorded.
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